Sheet detector



July 6 1926. I 1,591,126

C. W. HARROLD SHEET DETECTOR Filed Dec. 20, 1921 I 5 Sheets-Sheet 1' I um whom v 6%42 /69 Kfibrm/df July 6, 1926. 1,591,126 6. w. HARROLD v SHEET DETECTOR Filed Dec. 20, 1921 3 Sheets-Sheet 2 July 6, 1926. 1,591,126

C. .-W. HARROLD SHEET DETECTOR 7 5513 abto'wzem 'Paten t ecl July 6, 1926. I,

oHARL Es-w. imaeotmor' cIJEvELnrTm o io, fs ss1etfoit V'HARRIS'A'UTOI-T" f MATIo 'Prcnss'comP'ANY, orpLE'vnnANb, OHIO, A eoBfPoRATIoN 01'' onto} i Application fiie'ajneeember' 520,1 192:1; sexier No; 523,756;

My inyentionrelates. to automatic sheet-r 7 I detectors used more: particularly forusheet' fed printing; machines whereby one of, the

' cylinders vmaybe tripped not only upon the failure ofa sheet being advanceclfto the front stops; 1 but also for preventingcan 11m'-.

properly registered she detector alsofhas: for Tits obj ect: the tripping I objectistoprovide a. sheet cletectorioif such construction in its component parts as to'be extremely sensitiye in" operations With cape:- bilities of adjustment. so i as to accommodate the detector mechanism "for (litterentkinds of stock that: is feclflup to the front stops preparatory to being seizedrby the grippers onthe. impression-cylinder. r, s

Other objects and advantages-of my invention' will beapparent from-the following: detailed description thereofi and; a preferred embodiment is illustrated-in the accompanying drawings in which "Fig. 1 is a diagrammatic sectional'side my sheet-detector, the parts being: show/111' v whenino sheet is beingv'aclvancecl at'othe pressgv Fig. 2 is a viewsimilar' tozFig. l showing theparts after asheethas been properly regs, i isterecl and presented for printing; 1 Fig; Sfis; a similar view showing the position :of some of the operating parts: ishould a sheet ,b'eimproperly; presented -v-' Fig. 4- is-{a fragmentarysectional plan I VlQW'the section being-taken on the line l 4;

shown in Fig. 1

5 is'a diagrammatic section View takenon the: line 5-,5- of Fig. 4i look ing in the direction of the, arrow and show "'ing, meansfto thro W: as i the" impression cylinclen 6 Fig.5 6- is aides-i1 side; a e otthe detector Similar numerals refer Ito similar; partsthroughout the several figures:

et from passing into 1 the printing-machines Myi-improved sheet.-

Will be *he'reina-fter 7 side supports the: bearings for't'he' impression only. one beingshown in Fig. 5 tomove the.

impression-cylinder9 into and out of print ingurelation-with' its coacting.printingfmeme cylinder 9'moimtedrzon'theshaftvlO-which is carried at both enrls in} eccentric bushings; 11

her by shifting:the bush-ings 11;" Since this 1 isaa; common form otj.printin'gpress-eoml struction and is Well-known inthe artyzitis i not shown ilidetail inithe .ClraWings,- and' the operation; of the tripping of this cylinder 9'- more sp'ecifica-llyset' forth. j p f v s i The frame 8 also has joiirnal'led therein the upper'feeclrollshaftlQ carrying a-ser-ies roll shaft 14 carrying arseriesof lower feed rolls 1'5} Onlyyone set ofs-u'ch fe'ecl rolls-is necessary to beshown.- ;The; loWer'feed-rolls as i ofupper feed rolls 13; and the lower 'feech- V U rotated in unison'by any'suitable means-not 15 projectthrough suitably formed slots 1,61:

fin the-register plateal'i to which the suecefS- gsive sheets-gareadvaneecl ,by'theus'ual carrier vtapes1'8 passing ar elevation of a portion 'of 'a' printingema'c'hine I and sheet-feeding mechanism equipped Wlthv series oi front stops-2Q against; which the. leading, edge of. the sheet isalinecl before oundapulleys 19 as? shownbeing aclvanced'byf the feed-rolls 13; and;15j tothe usual grippers on the cylinder 1 9.

Adjacent the front-stops 2O area series of 1 finger foreach stopu These fingers 25 like-i Wise} project through the slots. 16',v and n'ormally; occupy a position on :a line parallel with the front stops :20' and slightly in" ad-T Vance'oiithev stops assho-wnain Figs-F1 and 4:. In Figs. 1 2' and 3 only oneset'o-ffingers.

Each of thesestops 20 is 'acljustably nou'nted on' the transverse shaft 21jby set-screws' 22y' pan-d the shaftf21fis oscillatec1 to raise and? lower the stops 20 in suitablytimed relation" y Wltl'l the actuation otthe feecl rolls by then reciprocating rod 23'p'ivoted" to2tlie arm 2e secured to one end detector fingers-25preierably one.-dete'ctor i and stops are shown with their actuating devices, the other sets along with their sepa I .rate a'ctuating devices being dupiioates are therefore not further shown or described; Each finger is adjustably clamped to the upper end 26 of the rocking member 27 piv- :oted on the pin 28secured to the bracket 29 atlxed to the front stop20. Theend 26 has the curved slot 30 formed therein through which the'thumbscrew 31 projects tovariably change the relativepositions of the finger 25 on the lever end 26,'and thereafter clampsame to secure the reqnisite setting of the finger 25 with the stop 20, according to the different grades or stock that 'is beingfedto the press. The coil spring 32 between the topofthe end 26 and the front stop 20 normallyhol'ds the finger 25 in a vertical position in advance of the stop as shown in Fig. 1. '.,The lower end of the rocking member 27 carries the .pin 33' which engages and slides in the vertical .slot 34.

formed in theupper end of the reciprocable rock-lever 35 pivoted on the'pm 36 projectingthroughlthe longitudinal slot out .in the lever 35, the pin 36 being secured to the bracket 38iadjustably secured to the't1e rod- 39 by the 'screw 40. The lowerend of the lever 35 carries the interposingthrust block 41 projecting laterally from such lever 35 as shown. The bracket 38 has the inclined arm 42 formed integrally therewith in which are journalled the transverse shafts 43 and 44.- I The shaft 44 carries the double arm lever 45 which is rocked back and forth in each cycle of operaticnby the reciprocating rod 46 pivoted to the lower arm 47 of this lever 45. The shaft 43-carries the collar 48 affixed a set-screw (not shown) to the shaft 43 from'whieh the arm 49 pro jects over the lever '45 as shown in Fig. 1."

' Thele'ver'45 has the 50 formed in, its

end while the arm 49 has the jaw '51 in its outer end the two aws prov1d1ngadovetazl opening between them and they are arranged to coact withtlie'thrust block 41 projectmg "from the endv of the lever 35. This mechanism, as herelnbefore explained,

is duplicated for each of the detector fingers 25. To the shaft 43 1s also secured the 1nteg ral arm or projection 52 adapted to en- 7 gage the end of the latch 53 pivoted Onthe the coil spring 57;

' pin 36, the latch being normally held in the notch 54 of the collar 55 on the shaft 56 by The shaft 56 is the'throwbif shaft for the tripping of the impression-cylinder 9 and. is held under tension by the torsion spring 60 shown in Fig. 4 so that when the latch 53 is lifted out of the notch 54 the shaft 56 is turned. in a clockwise direction by the spring .60 to rock the arm 61 whichis eonnect ed'by the rod 62 to the arn'r63 secured to the eccentric bushing 11 to trip the cylinder 9 as shown mFlgs. 4 and 5. The hand-lever 64 is secured to the shaft 56 to throw on the front stops 20v as shown in Figs. 1 and 4, and are preferablylocated near each front corner to be; engaged by the leading edge, of

the sheet.v 'As the sheet 65 (Fig.2),is fed up to the stops'20 the detector fingers 25 are forced backer depressed by the sheets until flushwith stops 20, which movement carries the. thrust block 41 out of its normal position between the jaws 50 and 51 as shown in Fig. 1, and swings the block 41 clear o'fithe coacting lever-45' and arm 49 throughthe sheet 65 is side-registered by devices not necessary. to be shown, the stops 20 are lowered to the level of theplate 17 and the sheet ;os cillation of the rock-lever 35 on the pinv 36 by therocking'of the member27 on the pin 28, the lever 45 approaching-the arm 49 as shown by the arrows in Fig.2. After the'j is fed on to the cylinder by the joint action of the two feed-rolls 13- and 15 rotating in the direction of the arrows shown'in Fig. 2.

The sheet 65 further depresses the fingers 25' to the position shown. in Fig.2 as the sheet is being-advanced to the cylinder 9. In this construction, the detector fingers 25 are forced backward by the leading edge of the sheet .65 until it'contacts with the front stops 20 and the fingers re main in this positionuntil the front-stops are lowered bythe'oscillation of theshaft 21- which lowers the 'arms'29 on which the fingers 25 are pivoted;.then the advancing edge "of'thesheet 65 passes over the tipsofthe fingers25 as they are swung clear of the path-of the sheet. ,Hence the'movement of the detector fingers 25 isfirst tilting of the fingers by the advancing sheet followed by a simultaneous movement of both fingers and stops out ofthe path of the sheet caused i by a lowering of the arms29.

However ifasheet is not presented to the i front stops 20 at-the proper time, or if one corner of the sheet lags. behind, or if a corner ofthesheetis torn or folded back upon itself so that" any one of the fingers 25 is permitted to remain in its upright position whereby the thrust block 41 is'retained in its position in the opening between the jaws 50 and 51 as the lever 45' is.

raised in its normal reciprocation in each cycle, theupward advance of the lever 45 will liftthe arm 49'throughthe "block 41 being caught between the jaws 50 and .51

and thereby the'latch 53 is lifted from the notch 54 as shownin Fig.3. .-The latch ver 64 being operated to turn the collar 55 in an anti-clockwise direction after thelever 45 has been lowered to the position shown in Fig.7 1, the spring 57 lowering the arms?) as the latch 53 is reset in this notchfi i. The

shape and proportions of the thrust block 41 are such as to readily permit the entrance of this block between the dovetail opening formed between the jaws 50 and 51 to secure a fine adjustment and setting for the action of the throw-off devices.

My improved sheet-detector may be-utilized to perform a double function in that it willtripthe impression-cylinder if'no sheet is fed to the front stops, and it will also trip] 7 V the press when a sheet is fed bu't: fails to I reach an accurate front register-position for any reason; it will also trip in case a corner of thesheet is -torn or folded back" or fails'to present an even edgealong the front;

stops after the 'front and side registering operations have been completed, whereby any one of the' suitably arranged detector fingers is leftin its upright position at that ings, which show and describean embodi Vment of my invention usedto throw-off the impression-cylinder; however my im 7 provements may be'likewise used with the particular movement in the cycle of operation when a properly registered sheet should remove all the detector fingers from their normal position in advance of the front stops.

'Va-rious changes may be made in the constructions shown without departing from the principlesand-scope of the claimed invention which isnot to be confined to the particular constructions herein described and illustrated in the accompanying drawintermediate or transfer-cylinder of an offset press to simultaneously separate same from the plate and impression cylinders.

Iclaim as my invention a" v 1. In a sheet-detector, a plurality of oscillatable detector. fingers stationarily positioned in the path of the sheet, but movable by the advancing sheet, a throw-ofi mecha- V nism, and connections comprising a pair of coacting jaws and interposed thrust block between each of said'fingers' and throw-off mechanism to operate the latter whenever any of said fingers is not swung forwardly by the edge of the sheet from its normal position and said block is retained between said'jaws. l 2. In a sheet-detector,

tionarily positioned in the path of the sheet, but each movable by the advancing sheet when alined against all "said stops, athrowand tl1row=ofi"-meolianism to operate the la t-' and saidblock is retainedbetween said jaws.

off mechanism, and connections 'co'mprisi-ng" a pair of coacting jaws and inter-posed thrnst block between eachiyof said fingers ter'flwhenever any offsaid fingers is not swung forwardly by -the leading edge of "the sheet from' its normal position and said: block is retained between said jaws.

3. In a sheet-detector, a plurality of dej tector fingers normally positioned in the path of the sheets vbut movable forwardly by the advancing sheet, a throw'-o'fimechanism, and mechanically operated conned" -tions comprising apair of movable jaws and aninterposed thrust block between each of said fingers and throw-off mechanism to operate the latterwhen any of said fingers is not moved from its normal position and said block'ismaintained in its operativ pg sition between said jaws. V

4;" In a sheet-detector, front stops, means for advancing a. sheet ,to said stops, a plurality' ofoscillatable detector ffingers Sta-- tiona'rily positioned inadvance of said stops in the path of the sheet, but movable when engaged by the-leading edgeof the sheet, a

soy

throw-off mechanism, and connectionscom- I prising a pair of coactlng jaws and'lnter .posed thrust block fbetweeneach of said;

fingers and throw-off mechanism to operate the latter whenever any of said fingers is not swung forwardly by the edge. of the sheet from its normal position and said,

blockv is retained between said jaws. V

.5. In a sheet-detector, ,frontstops, a plurality of detector fingers normally positioned in advance of said stops but movable forwardly and downwardly from'the path 'ofthe sheetiwhen engaged thereby, a throwoff mechanism, and mechanically operated connections .comprisinga pair of movable .j aws and an interposed thrust block between each of said-fingers and throw-off. me'cha' nism to operate the latter whenever any a of said fingers'isnot movedfrom its normal position and said block is maintained in its j operative position-between said jaws. p I

6.In a sheet-,detector,front stops, a se-" r1es of movable fingers adapted to be alined with said stops, athrow-off mechanism, and

connections comprising a pair of coacting jaws and interposed thrust block between each of said fingers and throw-ofi' mecha--' nism to operate the latter when any of said fingers is'not in alinement with said stops and said block is retainedzbetween said jaws, V 7 Ina sheet-detector, front stops, a movable finger adapted to be alined with said stops, .a throw-off mechanism, and'connec I tions comprising a pair of coacting j jaws front stops, a plu rality of:oscillatable' detector fingers sta'' ;8.' In a:sheetEdetector,spacedeapart front block between each of said fingers and o stops located in the path of the .sheet, a throw-off mechanism to operate the latter plurality of independently movable fingers Whenevera ny of said fingers is not brought 10 each adaptedto be alined Withsaid stops by in alinement with said stops and said block 7 the leading edge-of the sheet, wthro -ofi is retained between said jaws.

mechanism; and connections comprising a I r l pair of coasting jaws and interposed thrust CHARLES W. HARROLD. 

